Rubber composition and pneumatic tire

a technology of composition and rubber, applied in the direction of tire parts, tyre tread bands/patterns, vehicle components, etc., can solve the problems of poor abrasion resistance, achieve excellent abrasion resistance, enhance on-ice performance, and improve traction

Active Publication Date: 2020-09-24
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015]According to the present invention, a rubber composition allowing obtainment of a vulcanized rubber, which has further enhanced on-ice performance and has both excellent on-ice performance and excellent abrasion resistance, and a pneumatic tire which has further enhanced on-ice performance and has both excellent on-ice performance and excellent abrasion resistance can be provided.

Problems solved by technology

However, a tire with soft tread rubber generally has a problem that the tire has poor abrasion resistance on common road surfaces so that there is a trade-off relationship between on-ice performance and abrasion resistance of the tire.

Method used

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  • Rubber composition and pneumatic tire
  • Rubber composition and pneumatic tire
  • Rubber composition and pneumatic tire

Examples

Experimental program
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Effect test

examples

[0182]Hereinafter, the present invention will be described in more detail in view of Examples, but Examples are given for the purpose of exemplifying the present invention and do not limit the present invention at all.

Examples 1, 3, 6 to 10, and 13 and Comparative Examples 2, 4, and 6 to 8

[0183]With the mixing formulation shown in Table 2 to Table 6, rubber compositions of Examples and Comparative Examples were prepared by carrying out mixing in order of a first mixing step and a final mixing step using a common Banbury mixer. In addition, after the completion of the first mixing step, the mixture was extracted first from the Banbury mixer, the mixture was thereafter added again to the Banbury mixer, and the final mixing step was carried out. In addition, the maximum temperature of the mixture in the first mixing step was set at 170° C., and the maximum temperature of the rubber composition in the final mixing step was set at 110° C.

Examples 2, 4, 5, 11, and 12 and Comparative Examp...

examples 1 , 3 , 6 to 10

Examples 1, 3, 6 to 10, and 13 and Comparative Examples 2, 4, and 6 to 8

[0237]According to vulcanization of the rubber composition for 33 minutes at 145° C., vulcanized rubber was obtained. The storage modulus (G′) and the loss tangent (tan6) were measured for the obtained vulcanized rubber by using a device for measuring viscoelasticity ARES (manufactured by TA Instruments, Inc) in the condition of a temperature of -20° C., a strain of 1%, and a frequency of 15 Hz. The results are shown in Table 2 to Table 6.

examples 2 , 4 , 5 , 11

Examples 2, 4, 5, 11, and 12 and Comparative Examples 1, 3, and 5

[0238]According to vulcanization of the rubber composition for 33 minutes at 145° C., vulcanized rubber is obtained. The storage modulus (G′) and the loss tangent (tan6) are measured for the obtained vulcanized rubber by using a device for measuring viscoelasticity ARES (manufactured by TA Instruments, Inc) in the condition of a temperature of -20° C., a strain of 1%, and a frequency of 15 Hz. The results are shown in Table 2 to Table 6.

Examples 1, 3, 8, and 9 and Comparative Example 2

[0239]By using the rubber composition of the each Example and each Comparative Example in a tread, a test tire (tire size 195 / 65R15) was manufactured by a common method. The foaming ratio of a tread of the manufactured tire was calculated according to the above formula (1). Next, for the same tire, on-ice performance and abrasion resistance were evaluated according to the following method, and the overall evaluation was additionally obtai...

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Abstract

A rubber composition of the present invention contains 100 parts by mass of a rubber component (A) containing 45 to 75% by mass of natural rubber and 25 to 55% by mass of a conjugated diene-based polymer, in which a bonded styrene amount of the conjugated diene compound moieties is 25% or less, 1 to 40 parts by mass of a non-modified conjugated diene-based polymer (B) which has a weight average molecular weight of 5,000 or more but less than 40,000 in terms of polystyrene as measured by GPC and in which a bonded styrene amount of the conjugated diene compound moieties is less than 10% and a bonded vinyl amount of the conjugated diene compound moieties is 20% or more, and a filler (C), in which at least one of the conjugated diene-based polymers contained in the rubber component (A) is a modified conjugated diene-based polymer. With the rubber composition, a tire having further enhanced on-ice performance and having both excellent on-ice performance and excellent abrasion resistance is obtained.

Description

TECHNICAL FIELD[0001]The present invention relates to a rubber composition and a pneumatic tire.BACKGROUND ART[0002]Conventionally, as a tire for having safe driving even on ice in addition to common road surfaces, a studless tire with softened tread rubber has been used, and it is known that the on-ice performance of a tire is enhanced by softening the tread rubber. However, a tire with soft tread rubber generally has a problem that the tire has poor abrasion resistance on common road surfaces so that there is a trade-off relationship between on-ice performance and abrasion resistance of the tire.[0003]In this regard, to provide a rubber composition having enhanced friction coefficient on ice and an excellence in flexibility at low temperatures, wet-grip property and on-ice grip property, a rubber composition having as a rubber component at least one diene-based polymer selected from the group consisting of a natural rubber, an isoprene rubber, a styrene-butadiene rubber, a butadie...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08L7/00C08F136/06C08F212/08C08F236/06C08L53/02C08K3/013C08K5/20C08K5/17C08L23/08C08L29/04B60C1/00
CPCC08F236/06C08L53/025C08K3/013C08L23/08B60C1/0016C08K5/20C08F136/06C08F212/08C08L7/00B60C2200/04C08L2205/16C08K2201/004C08K5/17C08L29/04C08L15/00B60C2011/147B60C2011/145B60C2011/0025C08L2207/324Y02T10/86C08K3/36C08L9/00C08L57/02C08K3/04
Inventor TSUDA, SHUNSUKE
Owner BRIDGESTONE CORP
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